These theories also admit a class-S construction via a 6d \((2,0)\)  \(A_{2N-1}\)  SCFT compactified on a sphere \(C\)  with four punctures all of type \([N,N]\) . This construction only makes manifest an \(\mathrm {SU}(2)^4\)  subgroup of the \(\mathrm {Spin}(8)\)  flavor group, and does not make the antisymmetric \(\mathrm {SU}(2)\)  flavor factor or its associated mass deformation apparent [1]}. \(C\)  is identified with \(T^2/\mathbb {Z}_2\)  with the four punctures corresponding to the four \(\mathbb {Z}_2\)  orbifold fixed points. The antisymmetric hypermultiplet appears upon taking an appropriate zero-area limit of \(C\)  [2]}, and [3]} showed that by modifying the type of one puncture to be \([N, N-1, 1]\) , the theory manifests the antisymmetric \(\mathrm {SU}(2)\)  flavor symmetry. The class-S construction realizes the integrable system underlying the Coulomb branch geometry as a Hitchin system [4]}.
